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 BLIPTRDEC()
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 Purpose:
 Huge pointer decrement.

 Syntax:
 LPVOID BLIPTRDEC(LPPointer, niValue)

 Parameters:
 lpPointer  Memory pointer to decrement.
 niValue    Value by which to decrement pointer.

 Returns:
 Decremented pointer.

 Description:
 The BLIPTRDEC() function (decrement huge pointer) is the inverse of the
 BLIPTRINC() function - for more information on the use of these functions
 please see the entry for BLIPTRINC() below.

 Example:
 For example if BLOCK is some complex type then :                            
                                                                             
 1  memptr = (BLOCK huge *) halloc ((long) BLKMAX,sizeof (BLOCK));           
 2  if (memptr)                                                              
 3     {                                                                     
 4     tmpptr = memptr;                                                      
 5     for (i = 0; i < BLKMAX; i++)                                          
 6        {                                                                  
 7        ...               /* Some                                          
 operation */                                                                
 8        tmpptr--;         /* Point to previous                             
 block */                                                                    
 9        }                                                                  
 10    }                                                                     
                                                                             
 Line 8 can be replaced with:                                                
                                                                             
 tmpptr = BLIPTRDEC (tmpptr, (long) sizeof (BLOCK));